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XYLENE POWER LTD.

FNR MONITORING SYSTEM

By Charles Rhodes, P.Eng., Ph.D.

INTRODUCTION:
Elsewhere on this website Fast Neutron Reactors (FNRs) have been identified as the primary source of energy for meeting mankind's future energy needs. This web page focuses on the design of the FNR's monitoring system.
 

MONITORING SYSTEM OVERVIEW:
The monitoring system is ceiling mounted in the reactor space and looks down at the top surface of the primary liquid sodium pool. The monitoring system is concerned with the central 10 m diameter of the liquid sodium surface which is directly over the FNR core zone. The monitoring system actually has 7 sub-zones, each of which focuses on a reactor surface area about 4.0 m in diameter. Thus there is a central zone and there are 6 equally spaced zones around it. The monitoring system measures:
a) Surface temperature;
b) Gamma ray emission;
c) Indicator tube protrusion;
d) Indicator tube internal temperature,

Each monitoring sub-zone has an infra-red camera, a gamma ray camera and ____laser measuring tapes. There is a data set for each mobile fuel bundle.

The monitoring system is particularly concerned about reactor relative hot spots. Ideally the temperature of the liquid sodium in the indicator tubes should be radially uniform. Similarly the gamma ray emission from the indicator tubes should be radially uniform. Similarly the protrusion of the indicator tubes should be almost radially uniform.

A parameter that it may be worth while to monitor is acoustic activity in the primary sodium pool. Normally the primary sodium flows are laminar and generate little acoustic noise. However, if there is a severe reactor hot spot it will form sodium bubbles that may generate acoustic noise. Another source of acoustic noise will be the primary sodium filter which will likely have a submerged pump.

This web page last updated August 2, 2020.

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